regenerated using autoconf, includes dirfd test.
diff --git a/configure b/configure
index 7cd7e91..d6bd2bf 100755
--- a/configure
+++ b/configure
@@ -9396,7 +9396,7 @@
# checks for library functions
for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
- clock confstr ctermid execv faccessat fchmod fchmodat fchown fchownat \
+ clock confstr ctermid dirfd execv faccessat fchmod fchmodat fchown fchownat \
fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
futimens futimes gai_strerror \
getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \